题目内容：
根据下面短文内容，回答题。 Teaching and Learning
Many teachers believe that the responsibilities for learning lie with the student. If a long reading assignment is given, instructors expect students to be __________ (51) with the information in the reading even if they do not discuss it in class or __________ (52) an examination. The ideal student is__________(53) to be one who is motivated to learn for the sake of learning, not the one interested only in getting high__________ (54). Sometimes homework is returned with brief written__________(55) but without a grade. Even if a grade is not given, the student is __________ (56) for learning the material assigned. When research is __________ (57), the professor expects the student to take it actively and to complete it with minimum __________ (58). It is the student's responsibility to find books, magazines, and articles in the library. Professors do not have the time to __________ (59)how a university library works; they expect, students, particularly graduate students, to exhaust the__________(60) sources in the library. Professors will help students who need it,__________ (61)prefer that their students should not be too__________ (62) on them. In the united states professors have many other __________ (63) besides teaching, such as administrative or research work. Therefore, the time that a professor can spend __________ (64) a student outside of class is limited. If a student has problems with classroom work, the student should either __________ (65)a professor during office hours or make an appointment.
_____________ A．careful
B．happy
C．familiar
D．pleased
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